build fails on ubuntu 17.10 #7
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add -Wno-noexception-type |
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This is not an Closing the task. |
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Summary: Issue was raised by facebook/openr#7 Reviewed By: jstrizich Differential Revision: D6422429 fbshipit-source-id: b32388fbca49fd3d8ce72ae7677ea745c35a5c52
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thanks ! |
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Summary:
There is a race condition when KvStoreWrapper and ZMQ background threads are
destroyed. This diff is an attempt to explicitly destroy KvStoreWrapper in TearDown
Also use unique_ptr instead of shared_ptr
```
WARNING: ThreadSanitizer: data race (pid=49594)
Write of size 8 at 0x7ba000000220 by thread T1:
#0 close <null> (link_monitor_test+0xdb1f6a)
#1 zmq::signaler_t::~signaler_t() /home/engshare/third-party2/zeromq/4.3.1/src/zeromq-4.3.1/src/signaler.cpp:114:20 (link_monitor_test+0xbd1274)
Previous read of size 8 at 0x7ba000000220 by main thread:
#0 epoll_ctl <null> (link_monitor_test+0xd9bdef)
#1 epoll_del /home/engshare/third-party2/libevent/1.4.14b_hphp/src/libevent-1.4.14b-stable/epoll.c:485 (link_monitor_test+0xec4253)
#2 folly::EventBaseEvent::eb_event_del() <null> (link_monitor_test+0xa747ef)
#3 folly::EventHandler::~EventHandler() <null> (link_monitor_test+0xa74a70)
#4 std::_Hashtable<int, std::pair<int const, openr::OpenrEventBase::ZmqEventHandler>, std::allocator<std::pair<int const, openr::OpenrEventBase::ZmqEventHandler> >, std::__detail::_Select1st, std::equal_to<int>, std::hash<int>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::~_Hashtable() <null> (link_monitor_test+0x219620)
#5 openr::OpenrEventBase::~OpenrEventBase() <null> (link_monitor_test+0x212d8d)
#6 openr::KvStore::~KvStore() <null> (link_monitor_test+0x1bfbb7)
#7 openr::KvStore::~KvStore() <null> (link_monitor_test+0x1bfbe9)
#8 openr::KvStoreWrapper::~KvStoreWrapper() <null> (link_monitor_test+0x117533)
#9 std::_Sp_counted_ptr_inplace<openr::KvStoreWrapper, std::allocator<openr::KvStoreWrapper>, (__gnu_cxx::_Lock_policy)2>::_M_dispose() <null> (link_monitor_test+0x116fbd)
#10 LinkMonitorTestFixture::~LinkMonitorTestFixture() <null> (link_monitor_test+0xf8285)
#11 LinkMonitorTestFixture_BasicOperation_Test::~LinkMonitorTestFixture_BasicOperation_Test() <null> (link_monitor_test+0xf7ee9)
#12 void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) <null> (link_monitor_test+0xc4b2ae)
#13 __libc_start_main /home/engshare/third-party2/glibc/2.26/src/glibc-2.26/csu/libc-start.c:308:16 (libc.so.6+0x211a5)
```
Reviewed By: yi-xian
Differential Revision: D20148667
fbshipit-source-id: 71634c08df8ebbc98a6b8c4aa3329166834453f2
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Summary: As titled, several different approaches have been added to address original issue of crash when eventbase is destructed. See P135204939 ``` (gdb) bt #0 0x000000000187ea8e in re2::RE2::Set::Match (this=0x2, text=..., v=0x7fffd8c0d500, error_info=0x0) at re2/set.cc:110 #1 0x000000000072d304 in openr::KeyPrefix::keyMatch (this=<optimized out>, key=...) at openr/common/Util.cpp:50 #2 0x00000000006d3649 in openr::KvStoreFilters::keyMatch (this=0x7fb22c613660, key=..., value=...) at openr/kvstore/KvStore.cpp:69 #3 0x00000000006d60e4 in openr::KvStore::mergeKeyValues (kvStore=..., keyVals=..., filters=...) at openr/kvstore/KvStore.cpp:246 #4 0x00000000006e3813 in openr::KvStoreDb::mergePublication (this=0x7fb232fbad28, rcvdPublication=..., senderId=...) at openr/kvstore/KvStore.cpp:2835 #5 0x00000000006e32d7 in openr::KvStoreDb::processThriftSuccess (this=0x7fb232fbad28, peerName=..., pub=..., timeDelta=...) at openr/kvstore/KvStore.cpp:1395 #6 0x000000000070487b in openr::KvStoreDb::requestThriftPeerSync()::$_19::operator()(openr::thrift::Publication&&) const ( this=<optimized out>, pub=...) at openr/kvstore/KvStore.cpp:1338 #7 folly::futures::detail::wrapInvoke<openr::thrift::Publication, openr::KvStoreDb::requestThriftPeerSync()::$_19>(folly::Try<openr::thrift::Publication>&&, openr::KvStoreDb::requestThriftPeerSync()::$_19&&)::{lambda()#1}::operator()() const (this=<optimized out>) at folly/futures/Future-inl.h:99 #8 folly::futures::detail::InvokeResultWrapper<void>::wrapResult<folly::futures::detail::wrapInvoke<openr::thrift::Publication, openr::KvStoreDb::requestThriftPeerSync()::$_19>(folly::Try<openr::thrift::Publication>&&, openr::KvStoreDb::requestThriftPeerSync()::$_19&&)::{lambda()#1}>(folly::futures::detail::wrapInvoke<openr::thrift::Publication, openr::KvStoreDb::requestThriftPeerSync()::$_19>(folly::Try<openr::thrift::Publication>&&, openr::KvStoreDb::requestThriftPeerSync()::$_19&&)::{lambda()#1}) (fn=...) at folly/futures/Future-inl.h:91 #9 folly::futures::detail::wrapInvoke<openr::thrift::Publication, openr::KvStoreDb::requestThriftPeerSync()::$_19>(folly::Try<openr::thrift::Publication>&&, openr::KvStoreDb::requestThriftPeerSync()::$_19&&) (t=..., f=...) at folly/futures/Future-inl.h:109 #10 folly::Future<openr::thrift::Publication>::thenValue<openr::KvStoreDb::requestThriftPeerSync()::$_19>(openr::KvStoreDb::requestThriftPeerSync()::$_19&&) &&::{lambda(folly::Executor::KeepAlive<folly::Executor>&&, folly::Try<openr::thrift::Publication>&&)#1}::operator()(folly::Executor::KeepAlive<folly::Executor>&&, folly::Try<openr::thrift::Publication>&&) (this=<optimized out>, t=...) at folly/futures/Future-inl.h:1033 #11 folly::futures::detail::CoreCallbackState<folly::Unit, folly::Future<openr::thrift::Publication>::thenValue<openr::KvStoreDb::requestThriftPeerSync()::$_19>(openr::KvStoreDb::requestThriftPeerSync()::$_19&&) &&::{lambda(folly::Executor::KeepAlive<folly::Executor>&&, folly::Try<openr::thrift::Publication>&&)#1}>::invoke<folly::Executor::KeepAlive<folly::Executor>, folly::Try<openr::thrift::Publication> >(folly::Executor::KeepAlive<folly::Executor>&&, folly::Try<openr::thrift::Publication>&&) (this=<optimized out>, args=..., args=...) at folly/futures/Future-inl.h:145 ... #19 0x00000000015d00ee in folly::detail::function::FunctionTraits<void ()>::operator()() (this=0x7fb22c63b1f0) at folly/Function.h:416 #20 folly::EventBase::FunctionLoopCallback::runLoopCallback (this=0x7fb22c63b1c0) at folly/io/async/EventBase.h:188 #21 folly::EventBase::runLoopCallbacks (this=<optimized out>) at folly/io/async/EventBase.cpp:703 #22 folly::EventBase::loopBody (this=0x7fb23ecb9410, flags=1, ignoreKeepAlive=false) at folly/io/async/EventBase.cpp:402 #23 0x00000000015cdc60 in folly::EventBase::loopOnce (this=0x7fb23ecb9410, flags=0) at folly/io/async/EventBase.cpp:330 #24 folly::EventBase::~EventBase (this=0x7fb23ecb9410, vtt=<optimized out>) at folly/io/async/EventBase.cpp:211 #25 0x00000000006f284e in openr::KvStore::~KvStore (this=0x7fb23ecb9400) at openr/kvstore/KvStore.h:532 ``` To fix this, we introduced map to hold every individual future from thrift client. However, this occasionally will make KvStore destruction stuck when waiting for all futures to be fulfilled. We should NOT track every individual future, which is NOT necessary at all. From the crash trace, clearly, we are doing `mergePublications()` when invoking `processThriftPublication()` before checking if the peer is valid or NOT. Fix: Ignore the rest logic of callback `processThriftPublication()` if peerName is NOT valid. Reviewed By: saifhhasan Differential Revision: D24262710 fbshipit-source-id: fa69aaa5c6e43cfc861de7431b9c1e26195684a0
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Summary: Fix all pyre #7 in the codebase. Reviewed By: TangoRoxy Differential Revision: D29316355 fbshipit-source-id: 9667a74224d5fc49eb234d8fa00f006c7c50b17f
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…_ destroyed
Summary:
# background
Open/R has been haunted with unclean exit issue carried over multiple oncall rotations. Especially the notorious one in `KvStore`, like the following gdb traces happened inside T158806075
```
[xiangxu1121@devvm1867.nao0 ~/local/fbsource (470cb762a)]$ fboss-dbg-helper gdb fsw008.p062.f01.rva2
0) /home/xiangxu1121/local/fboss_dbg/fsw008.p062.f01.rva2/snapshot_2023-07-21-15:42:58
Enter the file's number: 0
0) /home/xiangxu1121/local/fboss_dbg/fsw008.p062.f01.rva2/snapshot_2023-07-21-15:42:58/cores/dogpile.unknown_tw_task.servicerouter.1583324.QUEUE_LAG.230715-025056 - Sat Jul 15 02:50:56 2023
1) /home/xiangxu1121/local/fboss_dbg/fsw008.p062.f01.rva2/snapshot_2023-07-21-15:42:58/cores/dynocat - Fri Jul 21 15:05:59 2023
2) /home/xiangxu1121/local/fboss_dbg/fsw008.p062.f01.rva2/snapshot_2023-07-21-15:42:58/cores/openr - Wed Jul 19 09:07:29 2023Enter the file's number: 2
INFO:root:Received output from file command:
INFO:root:/home/xiangxu1121/local/fboss_dbg/fsw008.p062.f01.rva2/snapshot_2023-07-21-15:42:58/cores/openr: ELF 64-bit LSB core file, x86-64, version 1 (SYSV), SVR4-style, from '/usr/sbin/openr --v=1 --vmodule=BgpSerializer*=1,FiberBgp*=2 --logging=DBG1;def', real uid: 36662, effective uid: 36662, real gid: 36337, effective gid: 36337, execfn: '/usr/sbin/openr', platform: 'x86_64'
(gdb) bt
#0 0x00000000035aa5b4 in std::_Hashtable<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, openr::KvStoreDb<apache::thrift::Client<openr::thrift::OpenrCtrlCpp> >::KvStorePeer>, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, openr::KvStoreDb<apache::thrift::Client<openr::thrift::OpenrCtrlCpp> >::KvStorePeer> >, std::__detail::_Select1st, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, false, true> >::find(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
at ./fbcode/third-party-buck/platform010-compat/build/libgcc/include/c++/trunk/bits/hashtable_policy.h:431
#1 0x00000000035baf56 in openr::KvStoreDb<apache::thrift::Client<openr::thrift::OpenrCtrlCpp> >::processThriftFailure(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, folly::basic_fbstring<char, std::char_traits<char>, std::allocator<char>, folly::fbstring_core<char> > const&, std::chrono::duration<long, std::ratio<1l, 1000l> >) ()
at ./fbcode/third-party-buck/platform010-compat/build/libgcc/include/c++/trunk/bits/unordered_map.h:869
#2 0x00000000035c4fac in openr::KvStoreDb<apache::thrift::Client<openr::thrift::OpenrCtrlCpp> >::requestThriftPeerSync()::{lambda(folly::exception_wrapper const&)#1}::operator()(folly::exception_wrapper const&) const ()
at fbcode/openr/kvstore/KvStore-inl.h:1753
#3 0x00000000035c4d0c in _ZZNO5folly6FutureINS_4UnitEE13thenErrorImplIZN5openr9KvStoreDbIN6apache6thrift6ClientINS4_6thrift12OpenrCtrlCppEEEE21requestThriftPeerSyncEvEUlRKNS_17exception_wrapperEE_EENSt9enable_ifIXntsr20isFutureOrSemiFutureINS_13invoke_detail6traitsIT_E6resultISD_EEEE5valueES2_E4typeEOSK_NS_7futures6detail18InlineContinuationEENUlONS_8Executor9KeepAliveISU_EEONS_3TryIS1_EEE_clESX_S10_ () at fbcode/folly/futures/Future-inl.h:137
#4 0x00000000035c4bea in _ZN5folly6detail8function14FunctionTraitsIFvRNS_7futures6detail8CoreBaseEONS_8Executor9KeepAliveIS7_EEPNS_17exception_wrapperEEE7callBigIZNS4_4CoreINS_4UnitEE11setCallbackIZNOS_6FutureISH_E13thenErrorImplIZN5openr9KvStoreDbIN6apache6thrift6ClientINSN_6thrift12OpenrCtrlCppEEEE21requestThriftPeerSyncEvEUlRKSB_E_EENSt9enable_ifIXntsr20isFutureOrSemiFutureINS_13invoke_detail6traitsIT_E6resultISB_EEEE5valueESL_E4typeEOS12_NS4_18InlineContinuationEEUlSA_ONS_3TryISH_EEE_EEvS18_OSt10shared_ptrINS_14RequestContextEES19_EUlS6_SA_SC_E_EEvS6_SA_SC_RNS1_4DataE () at fbcode/folly/futures/detail/Core.h:619
warning: Could not find DWO CU buck-out/v2/gen/fbcode/ad98fc21e927c889/folly/futures/detail/__core__/__objects__/Core.cpp.o(0xb8563f2cc6214b1a) referenced by CU at offset 0x10ac73 [in module /data/users/xiangxu1121/fboss_dbg/packages/openr:325/openr.debuginfo]
#5 0x0000000002408dc9 in folly::futures::detail::CoreBase::doCallback(folly::Executor::KeepAlive<folly::Executor>&&, folly::futures::detail::State)::$_0::operator()(folly::Executor::KeepAlive<folly::Executor>&&) () at fbcode/folly/Function.h:375
warning: Could not find DWO CU buck-out/v2/gen/fbcode/ad98fc21e927c889/folly/io/async/__async_base__/__objects__/EventBase.cpp.o(0x7990ef623e52da16) referenced by CU at offset 0x1029d6 [in module /data/users/xiangxu1121/fboss_dbg/packages/openr:325/openr.debuginfo]
#6 0x000000000266571d in folly::EventBase::loopMain(int, bool) () at fbcode/folly/Function.h:375
#7 0x0000000002d20cc3 in folly::EventBase::loopOnce(int) () at fbcode/folly/io/async/EventBase.cpp:345
#8 0x0000000002542c12 in folly::EventBase::~EventBase() () at fbcode/folly/io/async/EventBase.cpp:195
#9 0x00000000035a420e in openr::KvStore<apache::thrift::Client<openr::thrift::OpenrCtrlCpp> >::~KvStore() ()
at fbcode/openr/kvstore/KvStore.h:629
#10 0x0000000003585a9e in main ()
at ./fbcode/third-party-buck/platform010-compat/build/libgcc/include/c++/trunk/bits/unique_ptr.h:85
```
# RCA
High level speaking, the issue happens with the following order:
- Step1: `KvStoreDb::stop()` destructed `thriftPeers_` obj
- Step2: `KvStore::stop()` invokes `OpenrEventBase::stop()`, which destructs `folly::EventBase`, which will call `loopOnce` to clean up injected callbacks in the eventbase.
- Step3: In crash scenario, there are >1 callbacks being invoked(e.g. `processThriftSuccess` or `processThriftFailure`).
- Step4: Sample failures are:
- `processThriftSuccess` P576623566
- `processThriftFailure` P592005831
We can see there are callbacks being invoked with:
- `requestThriftPeerSync`
- `keepAlive`
# Fix
The fix should be straight-forward, which is to cancel the scheduled cb from `folly::AsyncTimeout` perspective via `reset()` or `cancelTimeout()` call.
NOTE: for the keepAlive `AsyncTimeout`, we can consider remove it by leveraging the socket keepalive option and simplify this logic.
Reviewed By: TangoRoxy
Differential Revision: D47691545
fbshipit-source-id: 67108399a7ce9f96d08682d45d03799e6ef608fd
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